How can I change and lock-in the aspect ratio when cropping in Camera Raw?

I edit portraits constantly. The default aspect ratio for the crop tool in Camera Raw is "Custom".  How can I change the default aspect ratio to 8x10, not just for this image, but for all editing from here on out? As it stands I have to select 8x10 for every image I crop, and that just slows down my workflow. It would be easier to select crop and have it set to the aspect ratio I need. Thanks!